Premium
Triphenylamine Based Random Copolymers: The Effect of Molecular Weight on Performance of Solar Cell and Optoelectronic Properties
Author(s) -
Goker Seza,
Hacioglu Serife O.,
Hizalan Gonul,
Aktas Ece,
Cirpan Ali,
Toppare Levent
Publication year - 2017
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201600544
Subject(s) - triphenylamine , homo/lumo , materials science , gel permeation chromatography , polymer , photovoltaics , absorption spectroscopy , cyclic voltammetry , organic solar cell , polymer chemistry , polymerization , photochemistry , analytical chemistry (journal) , energy conversion efficiency , absorption (acoustics) , chemistry , optoelectronics , photovoltaic system , organic chemistry , molecule , optics , electrochemistry , ecology , physics , electrode , composite material , biology
Two low band gap triphenylamine based random copolymers are synthesized via Pd‐catalyzed Stille polycondensation reaction to investigate the role of molecular weight on device performance and optoelectronic properties. 1 H NMR spectroscopy, UV−vis absorption spectroscopy, cyclic voltammetry, and gel permeation chromatography (GPC) are used for characterization of polymers. The polymerization conditions are optimized to achieve high molecular weight polymers with enhanced optoelectronic properties. PBTP1 reveals broad absorption in the wavelength range of 300–670 nm whereas PBTP2 has absorption in the wavelength range of 300–660 nm. Highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels are calculated as −5.43 and −3.20 eV for PBTP1 and −5.33 and −3.02 eV for PBTP2. The photovoltaic device containing donor PBTP1 and acceptor PCBM[70] in 1:3 weight ratio reveals the highest power conversion efficiency of 2.27%, with V oc of 0.63 V, J sc of 8.19 mA cm −2 , and fill factor of 44% under illumination of AM 1.5 G, 100 mW cm −2 . Organic photovoltaics (OPV) cells fabricated with PBTP2 demonstrate improved photovoltaic results due to higher molecular weight and enhanced optoelectronic properties. Photon‐to‐current efficiency of 3.65% with a current density of 14.73 mA cm −2 , V oc of 0.69 V, and fill factor of 36% are obtained.